The global tidal energy potential is estimated to be about terawatt ( W) in which about TW can be harvested from shallow waters. In certain regions the potential is high. For example in Europe, France and UK have tidal ranges of over m. In Canada, the Bay of Fundy in Nova Scotia has been identified as having high potential.
Tidal Barrage utilize the difference in height between low and high tides. A dam with a sluice is constructed; sea water flows in during high tide, and when the tide is low, water is released under pressure through turbines into the sea.
Tidal Stream generators has the same operating principle as wind turbines. They utilize tidal streams which flow when tides are moving in and out which causes turbine rotation and subsequently electricity generation by turning the generators. The electrical generators are installed directly into the tidal stream. Existing plants: SeaGen ( MW), Northern Ireland, operational since April 2008.
The rotation of the turbine creates electricity. Drawbacks of the tidal barrage are high civil infrastructure costs and environmental change. Some of the larger plants operating using the tidal barrage concept are La Rance Tidal Barrage ( MW), France; Sihwa Tidal Power Plant (254 MW), South Korea; Annapolis Royal Generating Station ( MW), Canada; and Jiangxia Tidal Power Station, China ( MW).
Tidal Lagoons work on a concept similar to tidal barrage – except for a perimeter embankment for water impoundment. Lagoons can thus be sited completely offshore or connected to the land. The same kind of turbines as used in a barrage scheme is used for electricity generation.
- Technical Insights - Research Process and Methodology
- Key findings
- History of Tidal Energy
- Tidal Plant Types
- New Trends: Dynamic Tidal Power
- Tidal Turbine Types
- Technical Features of Tidal Converters
- Tidal Power Supply Chain
- Tidal Power Stakeholders
- Tidal Energy: UK
- Tidal Energy: USA & Canada
- Tidal Energy: China & South Korea
- Tidal Energy: France & Japan
- Major Drivers and Restraints
- Drivers Explained
- Restraints Explained
- Environmental Impacts of Tidal Energy
- Key Technology Providers
- Technology Management Strategies
- Technology Roadmap - The Road Ahead
- Key Patents
- Contact Details